CVE-2015-4490

Name: CVE-2015-4490
Creator: NVD / NIST
Published: 2015-08-16T01:59:18.08+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.95%

Last modified Jun 17, 2026

CVE-2015-4490 is a vulnerability of currently unknown severity. The nsCSPHostSrc::permits function in dom/security/nsCSPUtils.cpp in Mozilla Firefox before 40.0 does not implement the Content Security Policy Level 2 exceptions for the blob, data, and filesystem URL schemes during wildcard source-expression matching, which might make it easier for remote attackers to conduct cross-site scripting (XSS) attacks by leveraging unexpected policy-enforcement behavior.. EPSS estimates a 2.95% chance of exploitation in the next 30 days.

Description

The nsCSPHostSrc::permits function in dom/security/nsCSPUtils.cpp in Mozilla Firefox before 40.0 does not implement the Content Security Policy Level 2 exceptions for the blob, data, and filesystem URL schemes during wildcard source-expression matching, which might make it easier for remote attackers to conduct cross-site scripting (XSS) attacks by leveraging unexpected policy-enforcement behavior.

Metrics

EPSS Probability

2.95%

85.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	<= 39.0.3
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	15.04
Opensuse	Opensuse	13.1
Opensuse	Opensuse	13.2
Oracle	Solaris	11.3

References

http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.htmlThird Party Advisory
http://www.mozilla.org/security/announce/2015/mfsa2015-91.htmlVendor Advisory
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
http://www.securitytracker.com/id/1033247
http://www.ubuntu.com/usn/USN-2702-1Third Party Advisory
http://www.ubuntu.com/usn/USN-2702-2Third Party Advisory
http://www.ubuntu.com/usn/USN-2702-3
https://bugzilla.mozilla.org/show_bug.cgi?id=1086999Issue Tracking
https://security.gentoo.org/glsa/201605-06
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.htmlThird Party Advisory
http://www.mozilla.org/security/announce/2015/mfsa2015-91.htmlVendor Advisory
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
http://www.securitytracker.com/id/1033247
http://www.ubuntu.com/usn/USN-2702-1Third Party Advisory
http://www.ubuntu.com/usn/USN-2702-2Third Party Advisory
http://www.ubuntu.com/usn/USN-2702-3
https://bugzilla.mozilla.org/show_bug.cgi?id=1086999Issue Tracking
https://security.gentoo.org/glsa/201605-06

Timeline

Published: Aug 16, 2015
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-4490?

How severe is CVE-2015-4490?

Severity scoring for CVE-2015-4490 is pending analysis. The EPSS model estimates a 2.95% probability of exploitation in the next 30 days.

How do I fix CVE-2015-4490?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-4490?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST